[webcrypto] Add parameter parsing for AES-GCM.

Source/bindings/v8/Dictionary.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 413 matching lines @@
     v8::Local<v8::Value> v8Value;
     if (!getKey(key, v8Value))
         return false;
 
     value = V8Uint8Array::toNativeWithTypeCheck(m_isolate, v8Value);
     return true;
 }
 
 bool Dictionary::get(const String& key, RefPtr<ArrayBufferView>& value) const
 {
+    bool unused;
+    return get(key, value, unused);
+}
+
+bool Dictionary::get(const String& key, RefPtr<ArrayBufferView>& value, bool& hasValue) const
+{
     v8::Local<v8::Value> v8Value;
-    if (!getKey(key, v8Value))
+    if (!getKey(key, v8Value)) {
+        hasValue = false;

[sof, 2014/02/25 22:01:45]

Hmm, this extra reference argument seems to end up with the same value as the
return value. Why do you need it?

[eroman, 2014/02/25 22:23:29]

You are right, my mistake.
Will remove

[eroman, 2014/02/25 22:31:00]

Thanks sof! updated.

         return false;
+    }
 
+    hasValue = true;
     value = V8ArrayBufferView::toNativeWithTypeCheck(m_isolate, v8Value);
     return true;
 }
 
 bool Dictionary::get(const String& key, RefPtr<MIDIPort>& value) const
 {
     v8::Local<v8::Value> v8Value;
     if (!getKey(key, v8Value))
         return false;
 
@@ skipping 304 matching lines @@
 {
     if (forConstructor()) {
         exceptionState().throwTypeError(detail);
     } else {
         ASSERT(!methodName().isEmpty());
         exceptionState().throwTypeError(ExceptionMessages::failedToExecute(interfaceName(), methodName(), detail));
     }
 }
 
 } // namespace WebCore